LUDOC-297 protocol: Update protocol document

[doc/protocol.git] / target.txt

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+Target
+~~~~~~
+[[target]]
+
+Lustre servers manage permanent storage on behalf of the clients. That
+storage is divided into logical resources for management data,
+metadata (namespace and index data), and object storage. Each such
+storage resource is called a target. Managment data is stored on a
+single management server (MGS) with a single target, also called the
+MGS. Namespace and index data are maintained on one or more metadata
+servers (MDSs), and each MDS may have several targets (MDTs). Object
+storage is maintained on object servers (OSSs), and each OSS can have
+several targets (OSTs), as well. Each target is based on an Object
+Storage Device (OSD) which can be either an ldikfs-based file system
+or a zfs-based file system.
+
+